diff options
Diffstat (limited to 'sound/arm/pxa2xx-ac97-lib.c')
| -rw-r--r-- | sound/arm/pxa2xx-ac97-lib.c | 63 |
1 files changed, 39 insertions, 24 deletions
diff --git a/sound/arm/pxa2xx-ac97-lib.c b/sound/arm/pxa2xx-ac97-lib.c index 88eec3847df..66de90ed30c 100644 --- a/sound/arm/pxa2xx-ac97-lib.c +++ b/sound/arm/pxa2xx-ac97-lib.c @@ -16,11 +16,14 @@ #include <linux/interrupt.h> #include <linux/clk.h> #include <linux/delay.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/gpio.h> #include <sound/ac97_codec.h> #include <sound/pxa2xx-lib.h> -#include <asm/irq.h> +#include <mach/irqs.h> #include <mach/regs-ac97.h> #include <mach/audio.h> @@ -31,7 +34,7 @@ static struct clk *ac97_clk; static struct clk *ac97conf_clk; static int reset_gpio; -extern void pxa27x_assert_ac97reset(int reset_gpio, int on); +extern void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio); /* * Beware PXA27x bugs: @@ -114,8 +117,7 @@ static inline void pxa_ac97_warm_pxa25x(void) { gsr_bits = 0; - GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN; - wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); + GCR |= GCR_WARM_RST; } static inline void pxa_ac97_cold_pxa25x(void) @@ -126,8 +128,6 @@ static inline void pxa_ac97_cold_pxa25x(void) gsr_bits = 0; GCR = GCR_COLD_RST; - GCR |= GCR_CDONE_IE|GCR_SDONE_IE; - wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1); } #endif @@ -137,10 +137,10 @@ static inline void pxa_ac97_warm_pxa27x(void) gsr_bits = 0; /* warm reset broken on Bulverde, so manually keep AC97 reset high */ - pxa27x_assert_ac97reset(reset_gpio, 1); + pxa27x_configure_ac97reset(reset_gpio, true); udelay(10); GCR |= GCR_WARM_RST; - pxa27x_assert_ac97reset(reset_gpio, 0); + pxa27x_configure_ac97reset(reset_gpio, false); udelay(500); } @@ -155,28 +155,21 @@ static inline void pxa_ac97_cold_pxa27x(void) clk_enable(ac97conf_clk); udelay(5); clk_disable(ac97conf_clk); - GCR = GCR_COLD_RST; - udelay(50); + GCR = GCR_COLD_RST | GCR_WARM_RST; } #endif #ifdef CONFIG_PXA3xx static inline void pxa_ac97_warm_pxa3xx(void) { - int timeout = 100; - gsr_bits = 0; /* Can't use interrupts */ GCR |= GCR_WARM_RST; - while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) - mdelay(1); } static inline void pxa_ac97_cold_pxa3xx(void) { - int timeout = 1000; - /* Hold CLKBPB for 100us */ GCR = 0; GCR = GCR_CLKBPB; @@ -192,14 +185,13 @@ static inline void pxa_ac97_cold_pxa3xx(void) GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN); GCR = GCR_WARM_RST | GCR_COLD_RST; - while (!(GSR & (GSR_PCR | GSR_SCR)) && timeout--) - mdelay(10); } #endif bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97) { unsigned long gsr; + unsigned int timeout = 100; #ifdef CONFIG_PXA25x if (cpu_is_pxa25x()) @@ -216,7 +208,11 @@ bool pxa2xx_ac97_try_warm_reset(struct snd_ac97 *ac97) pxa_ac97_warm_pxa3xx(); else #endif - BUG(); + snd_BUG(); + + while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) + mdelay(1); + gsr = GSR | gsr_bits; if (!(gsr & (GSR_PCR | GSR_SCR))) { printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n", @@ -232,6 +228,7 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_try_warm_reset); bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97) { unsigned long gsr; + unsigned int timeout = 1000; #ifdef CONFIG_PXA25x if (cpu_is_pxa25x()) @@ -248,7 +245,10 @@ bool pxa2xx_ac97_try_cold_reset(struct snd_ac97 *ac97) pxa_ac97_cold_pxa3xx(); else #endif - BUG(); + snd_BUG(); + + while (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)) && timeout--) + mdelay(1); gsr = GSR | gsr_bits; if (!(gsr & (GSR_PCR | GSR_SCR))) { @@ -312,7 +312,7 @@ int pxa2xx_ac97_hw_resume(void) EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_resume); #endif -int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev) +int pxa2xx_ac97_hw_probe(struct platform_device *dev) { int ret; pxa2xx_audio_ops_t *pdata = dev->dev.platform_data; @@ -338,8 +338,21 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev) } if (cpu_is_pxa27x()) { - /* Use GPIO 113 as AC97 Reset on Bulverde */ - pxa27x_assert_ac97reset(reset_gpio, 0); + /* + * This gpio is needed for a work-around to a bug in the ac97 + * controller during warm reset. The direction and level is set + * here so that it is an output driven high when switching from + * AC97_nRESET alt function to generic gpio. + */ + ret = gpio_request_one(reset_gpio, GPIOF_OUT_INIT_HIGH, + "pxa27x ac97 reset"); + if (ret < 0) { + pr_err("%s: gpio_request_one() failed: %d\n", + __func__, ret); + goto err_conf; + } + pxa27x_configure_ac97reset(reset_gpio, false); + ac97conf_clk = clk_get(&dev->dev, "AC97CONFCLK"); if (IS_ERR(ac97conf_clk)) { ret = PTR_ERR(ac97conf_clk); @@ -359,7 +372,7 @@ int __devinit pxa2xx_ac97_hw_probe(struct platform_device *dev) if (ret) goto err_clk2; - ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL); + ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "AC97", NULL); if (ret < 0) goto err_irq; @@ -382,6 +395,8 @@ EXPORT_SYMBOL_GPL(pxa2xx_ac97_hw_probe); void pxa2xx_ac97_hw_remove(struct platform_device *dev) { + if (cpu_is_pxa27x()) + gpio_free(reset_gpio); GCR |= GCR_ACLINK_OFF; free_irq(IRQ_AC97, NULL); if (ac97conf_clk) { |